package cn.pro.syg.jdbc;

import java.sql.*;
import java.util.Scanner;

public class AppLogin {
    public static void main(String[] args) throws Exception {
        System.out.println("请输入账号");
        Scanner scanner = new Scanner(System.in);
        String username = scanner.nextLine();

        System.out.println("请输入密码");
        String password = scanner.nextLine();

        login(username,password);
    }

    public static void login(String n,String p) throws Exception {
        System.out.println("username="+n);
        System.out.println("password="+p);
        String sql="SELECT id FROM`user` WHERE username='" + n +
                "' AND `password`=MD5('" + p + "')";
        System.out.println("组成的SQL语句是：" + sql);

        Class.forName("com.mysql.jdbc.Driver");
        String url="jdbc:mysql://localhost:3306/test?useSSL=false";
        String username="root";
        String password="root";
        Connection connection = DriverManager.getConnection(url, username, password);
        Statement statement = connection.createStatement();
        ResultSet set=statement.executeQuery(sql);
        if ((set.next())){
            System.out.println("登录成功！");
        }
        else{
            System.out.println("登录失败！");
        }

    }
    public static void loginPlus(String n,String p) throws Exception {

        System.out.println("username="+n);
        System.out.println("password="+p);
        String sql="SELECT id FROM `user` WHERE username = ?  AND `password` = MD5(?)";

        Class.forName("com.mysql.jdbc.Driver");
        String url="jdbc:mysql://localhost:3306/test?useSSL=false";
        String username="root";
        String password="root";
        Connection connection = DriverManager.getConnection(url, username, password);

        PreparedStatement ps = connection.prepareStatement(sql);

        ps.setString(1,n);
        ps.setString(2,p);
        ResultSet set=ps.executeQuery();

        if (set.next()) {
            System.out.println("登录成功！");
        } else {
            System.out.println("登录失败");
        }
    }

}
